Shower water burning hot

[Tally101]

Hi All

We had our bathroom overhauled a couple of weeks ago including a thermostatic shower but since then in our ensuite which has a mixer shower the water in the ensuite when you turn on the water at the normal point the water runs that hot it will burn your skin we then turn it down a long way into the cold area and it goes colder so we can use it, then it goes cold
is this because of the work done in the bathroom or is the mixer going faulty.
Thanks

 

[johnny2007]

Shower bar faulty.
I had the same problem with an aqualisa bar.
As it is under warranty, get it replaced.
Btw, if you have a low pressure system you must install a low pressure shower bar.
For high pressure systems it doesn't matter.

 

[Tally101]

Sorry , its the ensuite that has a mixer shower tap thats the problem not the new shower bar

 

[johnny2007]

Sorry , its the ensuite that has a mixer shower tap thats the problem not the new shower bar

Same thing.
Have you got a high or low pressure system?
If low pressure, is the mixer low pressure?

 

[Tally101]

Cold water comingin has a 3 bar regulator on the incoming, can you explain why it’s the new shower bar causing the mixer to misbehave please

 

[johnny2007]

No, I don't think it's the shower bar that's causing the problem.
I think it's either a faulty mixer, debris in the cartridge due to not flushing pipes on installation or the wrong mixer (high pressure mixer fitted on a low pressure system).

 

[oldbuffer]

1. Shower make and model? Photograph?
2. What type of hot water system:
2a. Combi?
2b. Vented hot water (hot water cylinder (HWC) probably in airing cupboard, cold water storage cistern (CWSC) probably in loft)?
2c. Vented as above with shower pump(s)?
2d. Unvented hot water system (largely as vented but no CWSC in loft, probably large HWC could be anywhere)?

 

[Tally101]

Mixer has been in 20 years , sealed system with tank , system boiler no shower pumps

 

[johnny2007]

20 years=clean the cartridge with vinegar.
Is still causing problems, replace.

 

[opps]

I guess it may be possible that the new work resulted in crud flowing in to the mixer valve.